EP2080787B1 - Composition de résine rapidement dégradable et récipient biodégradable utilisant cette composition - Google Patents

Composition de résine rapidement dégradable et récipient biodégradable utilisant cette composition Download PDF

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Publication number
EP2080787B1
EP2080787B1 EP07828406.4A EP07828406A EP2080787B1 EP 2080787 B1 EP2080787 B1 EP 2080787B1 EP 07828406 A EP07828406 A EP 07828406A EP 2080787 B1 EP2080787 B1 EP 2080787B1
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Prior art keywords
aliphatic polyester
resin composition
readily degradable
acid
degradable resin
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German (de)
English (en)
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EP2080787A4 (fr
EP2080787A1 (fr
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Seishi Yoshikawa
Mitsuhiro Yoshida
Masahito Kogure
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Group Holdings Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • B65D65/466—Bio- or photodegradable packaging materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/16—Compositions of unspecified macromolecular compounds the macromolecular compounds being biodegradable
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/06—Biodegradable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00—Receptacles
    • Y10S220/30—Biodegradable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1397—Single layer [continuous layer]

Definitions

  • the present invention relates to a readily degradable resin composition constituting a biodegradable container that facilitates resource recycling.
  • Biodegradable polylactic acid resin compositions and the like are proposed as packaging materials (see Patent Documents 1 and 2).
  • a packaging container using such a biodegradable resin composition is sequentially degraded from the surface of the container.
  • complete degradation of the whole container takes a considerable time.
  • there is a problem that such a biodegradable container has readily degradable portions and hardly degradable portions, since the degradation rate is influenced by the internal structure of the resin such as the crystallinity of the resin and the molecular orientation thereof.
  • Patent Document 1 Japanese Patent Application Publication No. Hei 11-116788
  • Patent Document 2 Japanese Patent Application Publication No. Hei 9-316181
  • An object of the present invention is to provide a readily degradable resin composition with a great biodegradability.
  • the present invention provides a readily degradable resin composition comprising:
  • the present invention also provides a readily degradable resin composition comprising:
  • the present invention provides a biodegradable container including the readily degradable resin composition.
  • a container or the like with an excellent biodegradability can be obtained from the readily degradable resin composition according to the present invention.
  • biodegradable aliphatic polyester (A) examples include a polylactic acid resin; polybutylene succinate; polycaprolactone; polyhydroxybutyrate; a polybutylene succinate/adipate copolymer. These polyesters may be used alone or in combination of two or more kinds thereof.
  • the polylactic acid resin is not particularly limited, as long as the polylactic acid resin is a polyester resin obtained by polymerizing lactic acid.
  • the polylactic acid resin may be a homopolymer, a copolymer or a polymer blend of polylactic acid.
  • component to form such a copolymer examples include polyvalent alcohols such as ethylene glycol, propylene glycol, butanediol, octanediol, dodecanediol, neopentyl glycol, glycerine, pentaerythritol, sorbitan, bisphenol A, and polyethylene glycol; dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, glutaric acid, decanedicarboxylic acid, cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid and anthracene dicarboxylic acid; hydroxycarboxylic acids such as glycolic acid, hydroxypropionic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, and hydroxybenzoic acid; lactones such as glycolide, caprolactone, butyrolactone, valerolactone, propiolac
  • polymer to be blended examples include celluloses, chitin, glycogen, chitosan, polyamino acid, and starch.
  • lactic acid used in polymerization may be any of L-isomer and D-isomer, or a mixture of L-isomer and D-isomer.
  • Examples of preferred biodegradable aliphatic polyester (A) include a polylactic acid resin and polybutylene succinate.
  • the molecular weight of the biodegradable aliphatic polyester (A) is not particularly limited; however, in consideration of mechanical properties and processability, the molecular weight is preferably in a range of 5,000 to 1,000,000, and more preferably in a range of 10, 000 to 500, 000, in weight average molecular weight.
  • the aliphatic polyester (B) is biodegradable at a higher degradation rate than that of the aliphatic polyester (A), and has a melt viscosity of 50 Pa•S or less at 190°C and at a shear rate of 1 rad/s or a solution viscosity ( ⁇ inh) of 0.25 dl/g or less measured under conditions of a concentration of 0.4 g/dl and of a temperature of 30°C in a solvent of m-chlorophenol and 1,2,4-trichlorobenzene mixed at a weight ratio of 4:1.
  • “being biodegradable at a higher degradation rate” refers to the fact that, when a simple polymer is enzymatically degraded in an aqueous solution, the amount of eluted degradation products per day (degradation rate) is larger (higher) than that of the aliphatic polyester (A), and preferably refers to the fact that the amount of the degradation product (degradation rate) of the single polymer is twice or more as large (high) as that of the aliphatic polyester (A).
  • the aliphatic polyester (B) which is biodegradable at a higher degradation rate than that of the aliphatic polyester (A) is referred to as a "readily degradable aliphatic polyester (B)" for the sake of convenience (an aliphatic polyester (B') to be described later is similarly referred to as a “readily degradable aliphatic polyester (B')”).
  • an example of the aliphatic polyester having a melt viscosity of 50 Pa•S or less at 190°C and at a shear rate of 1 rad/s or a solution viscosity ( ⁇ inh) of 0.25 dl/g or less measured under conditions of a concentration of 0.4 g/dl and of a temperature of 30°C in a solvent of m-chlorophenol and 1,2,4-trichlorobenzene mixed at a weight ratio of 4: 1 includes an aliphatic polyester having such a low molecular weight as a number average molecular weight of 30000 or less.
  • a readily degradable resin composition including the readily degradable aliphatic polyester (B) When a readily degradable resin composition including the readily degradable aliphatic polyester (B) is placed under degrading conditions, for example, in an enzyme solution, the readily degradable aliphatic polyester (B) rapidly degrades, forming a large number of pores inside the aliphatic polyester (A) . For this reason, the surface area on which the enzyme acts is increased, resulting in an increased degradation rate of the aliphatic polyester (A).
  • the readily degradable aliphatic polyester (B) include polyethylene oxalate, poly(neopentyl) oxalate (PNOx), polyethylene maleate, and the like.
  • the readily degradable resin composition of the present invention includes: an aliphatic polyester (A) which is biodegradable; and an aliphatic polyester (B') which is biodegradable at a higher degradation rate than that of the aliphatic polyester (A) and which releases, upon hydrolysis, an acid showing a pH of 2.0 or less when dissolved in water at a concentration of 0.005 g/ml.
  • the aliphatic polyester (B') releases, upon hydrolysis, an acid with a low pH of 2.0 or less, for example, pH 1.5 or less, or pH 1.3 or less, and preferably pH 1.0 or less.
  • the acid to be released include oxalic acid and maleic acid.
  • the aliphatic polyester (A) degrades rapidly. This is presumably because, when water enters and elutes the aliphatic polyester (B'), the eluted acid component hydrolyzes the aliphatic polyester (A) such as polylactic acid, causing a large number of cracks inside the aliphatic polyester (A), which further increases the surface area on which an enzyme acts.
  • the number average molecular weight of the aliphatic polyester (B') is preferably 30000 or less, that is, the aliphatic polyester (B') preferably has a solution viscosity ( ⁇ inh) of 0.25 dl/g or less measured under conditions of a concentration of 0.4 g/dl and of a temperature of 30°C in a solvent of m-chlorophenol and 1,2,4-trichlorobenzene mixed at a weight ratio of 4:1 or has a melt viscosity of 50 Pa•S or less at 190°C and at a shear rate of 1 rad/s.
  • ⁇ inh solution viscosity
  • the aliphatic polyester (B') can not only cause cracks in the aliphatic polyester (A) by releasing an acid upon hydrolysis, but also form pores inside the aliphatic polyester (A) by the elution. As a result, a larger number of enzymatic action sites can be formed inside the aliphatic polyester (A), which can further accelerate the degradation rate.
  • Examples of the readily degradable aliphatic polyester (B') include polyethylene oxalate, poly(neopentyl) oxalate (PNOx), polyethylene maleate, and the like.
  • the readily degradable aliphatic polyester (B) or (B') is preferably dispersed in the aliphatic polyester (A).
  • An enzyme can enter voids and act in the voids from which the degraded readily degradable aliphatic polyester (B) or (B') is released and dissolved into water.
  • the readily degradable resin composition is degraded not only from the surface thereof, but also from the inside thereof. For this reason, the degradation rate is accelerated.
  • the readily degradable aliphatic polyester (B) or (B') is preferably present in the aliphatic polyester (A) in a uniformly and finely dispersed manner.
  • One or more monomer components of the aliphatic polyester (A) may be polymerized to the readily degradable aliphatic polyester (B) or (B'), in order to improve the dispersibility of the readily degradable aliphatic polyester (B) or (B') in the aliphatic polyester (A).
  • the readily degradable aliphatic polyester (B) or (B') is preferably highly polarized, i.e., preferably has high affinity to water.
  • the readily degradable aliphatic polyester (B) or (B') as described above has an increased hydrolysis rate.
  • a large number of pores are formed rapidly inside the aliphatic polyester (A), which increase the area on which an enzyme acts.
  • the polarity can be indicated by a SP value (solubility parameter) calculated by the Fedors method ( Polym. Eng. Sci., 14, 147-154 (1974 )).
  • the SP value should be, in an example case, 22.0 or more, 23.0 or more, or 24.0 or more and is preferably 25.0 or more.
  • the content of the readily degradable aliphatic polyester (B) or (B') is preferably 1 to 30% by weight, and more preferably 5 to 20% by weight, in consideration of mechanical properties and processability.
  • the readily degradable resin composition of the present invention can be produced by uniformly mixing the biodegradable aliphatic polyester (A) and the readily degradable aliphatic polyester (B) or (B') by an ordinary method.
  • the biodegradable aliphatic polyester (A) and the readily degradable aliphatic polyester (B) or (B') are simultaneously fed to a single- or twin-screw extruder-kneader to be melt-mixed, and thereafter are palletized.
  • the readily degradable resin composition of the present invention can be produced.
  • the melt-extrusion temperature is generally 100 to 250°C; however, those skilled in the art can set any melt-extrusion temperature appropriately, in consideration of the glass transition temperatures, the melting points, and the mixing ratio of the biodegradable aliphatic polyester (A) and the readily degradable aliphatic polyester (B) or (B') to be used.
  • the readily degradable resin composition of the present invention may be blended with publicly-known additives such as a plasticizer, a heat stabilizer, a light stabilizer, an antioxidant, an ultraviolet absorber, a fire retardant, a coloring agent, a pigment, a filler, a bulking agent, a mold release agent, an antistatic agent, a perfume, a lubricant, a foaming agent, an antibacterial/antifungal agent, and an nucleating agent, if necessary.
  • a resin other than the biodegradable aliphatic polyester (A) and the readily degradable aliphatic polyester (B) or (B') may be blended within a range not impairing effects of the present invention.
  • water soluble resins such as polyethylene glycol, and polyvinyl alcohol as well as other polymers such as polyethylene, polypropylene, an ethylene-propylene copolymer, an acid modified polyolefin, an ethylene-methacrylic acid copolymer, an ethylene-vinyl acetate copolymer, an ionomer resin, polyethylene terephthalate, polybutylene terephthalate, polyvinyl acetate, polyvinyl chloride, polystyrene, a polyester rubber, a polyamide rubber, a styrene-butadiene-styrene copolymer, and the like can be blended.
  • a copolymer of the biodegradable aliphatic polyester (A) and the readily degradable aliphatic polyester (B) or (B') may be blended in order to improve dispersibility of the readily degradable aliphatic polyester (B) or (B').
  • a publicly-known forming method can be used to produce a container using the readily degradable resin composition of the present invention.
  • a multilayer film, a multilayer sheet, a multilayer parison, a multilayer pipe, and the like can be molded by extrusion molding using a number of extruders, the number being equivalent to the number of kinds of resin and using a multiple die for multilayer.
  • a multilayer preform for bottle forming can be produced by co-injection molding such as a simultaneous injection method or a sequential injection method using a number of injection molding machines, the number being equivalent to the number of kinds of resin.
  • a packaging material such as a film can be used for a pouch of various forms or as a top member of a tray or a cup.
  • Examples of pouch includes three- or four-side sealed flat pouches, pouches with a gusset, standing pouches, pillow packaging bags and the like. These pouches and bags can be produced by a publicly-known pouch or bag forming method.
  • a packaging container of a cup shape or a tray shape can be obtained by subjecting the film or the sheet to means such as vacuum molding, pressure molding, stretch molding or plug-assist molding.
  • An extrusion coating method or a sandwich lamination can be used to produce a multilayer film or a multilayer sheet. Meanwhile, a single-layer or multilayer film formed in advance can be laminated by dry lamination to produce a multilayer film or a multilayer sheet. Examples include lamination of a transparent biodegradable deposition film by dry lamination onto a double layered co-extrusion film formed of a readily degradable resin composition/a polylactic acid (sealant) layer and a method in which two layers of a readily degradable resin composition/polylactic acid (sealant) are extrusion-coated onto a double layered film of polylactic acid/polyglycolic acid laminated by dry lamination with an anchoring agent interposed therebetween.
  • the lamination method is not limited to these.
  • a bottle or a tube can be easily molded by pinching-off a parison, a pipe or a preform with a pair of split dies and then by blowing a fluid into the pinched-off parison, pipe or preform.
  • an oriented blow-molded bottle and the like can be obtained as follows. Specifically, a pipe or a preform is cooled, thereafter, heated to an orientation temperature, and then oriented in the axial direction, while blow-oriented in the circumferential direction by a fluid pressure.
  • the melt viscosity (Pa•S) of synthesized polyethylene oxalate that was vacuum-dried at 120°C for 1 hour was measured by use of a rheometer (ARES manufactured by TA Instruments, Inc.) at 190°C and at a shear rate of 1 rad/s.
  • a rheometer manufactured by TA Instruments, Inc.
  • Synthesized polyethylene oxalate that was vacuum-dried at 120°C for 1 hour was used.
  • polylactic acid LACEA H-100 manufactured by Mitsui Chemicals, Inc.
  • polyethylene oxalate 0.80 g of polylactic acid (LACEA H-100 manufactured by Mitsui Chemicals, Inc.) and 0.20 g of polyethylene oxalate were dissolved in 10 to 12 ml of an HFIP solvent (hexafluoroisopropanol manufactured by Central Glass Co., Ltd.) to achieve a content of polyethylene oxalate in polylactic acid of 20% by weight, and then the mixture was cast on a Petri dish. After the cast, overnight drying was performed in a vacuum dryer kept at 40°C. The film thickness after drying was 40 ⁇ m.
  • HFIP solvent hexafluoroisopropanol manufactured by Central Glass Co., Ltd.
  • An enzymatic degradation solution was prepared by adding 12 ⁇ l of the enzyme solution into 10 ml of the 0.01 M Tris-HCl buffer (pH 8.0). Into the enzymatic degradation solution, the cast film cut into 1 cm ⁇ 2 cm was immersed, and shaken at 37°C and at 50 rpm. 16 hours, 48 hours, 120 hours, and 168 hours after the start of the degradation, the degradation state of the film was visually observed and the enzyme solution was exchanged. Table 1 shows the results of the degradation. Note that "Start of collapse” means a state where change in the shape of the film, for example, hole formation starts to appear, and "Completely degraded” means a state where the film collapses and the original shape is lost.
  • Example 2 was conducted in the same manner as that in Example 1 except that the temperature in the enzymatic degradation test was changed to 60°C.
  • Example 3 was conducted in the same manner as that in Example 1 except that the content of polyethylene oxalate was changed to 5% by weight.
  • Example 4 was conducted in the same manner as that in Example 3 except that the temperature in the enzymatic degradation test was changed to 60°C.
  • Comparative Example 1 was conducted in the same manner as that in Example 1 except that polyethylene oxalate was not used and that only polylactic acid was used.
  • Comparative Example 2 was conducted in the same manner as that in Comparative Example 1 except that the temperature in the enzymatic degradation test was changed to 60°C.
  • Comparative Example 3 was conducted in the same manner as that in Example 1 except that polyethylene oxalate with a solution viscosity ( ⁇ inh) of 1.2 dl/g was used and that the content thereof was changed to 5%.
  • FIG. 1 shows electron microphotographs of the films of Example 3 and Comparative Example 1 enzymatically degraded for 48 hours.
  • Fig. 2 Weight decrease of the films of Examples 1 and 3 and Comparative Example 1 were measured after immersion in hot water at 60°C. The results are shown in Fig. 2 . Meanwhile, Fig. 3 shows electron microphotographs of the films of Example 3 and Comparative Example 1 immersed in water at 37°C for 48 hours. These results show that polyethylene oxalate dispersed in polylactic acid degraded and was eluted into water, and thus voids were formed in the films of polylactic acid.
  • a film of 300 ⁇ m was formed by heating an appropriate amount of a polyethylene oxalate resin at 120°C for 5 minutes and thereafter by heat-pressing the polyethylene oxalate resin at a pressure of 30 kgf/cm 2 for 2 minutes.
  • polylactic acid a film of 100 ⁇ m was formed by the same method except that the temperature was changed to 200°C.
  • An enzymatic degradation solution was prepared by adding 12 ⁇ l of the enzyme solution into 10 ml of the 0.01 M Tris-HCl buffer (pH 8.0).
  • the polyethylene oxalate film with a thickness of 300 ⁇ m and cut into 1 cm ⁇ 1 cm was immersed, and shaken at 37°C and at 50 rpm. 24 hours after the start of degradation, supernatant liquid was taken out, passed through a filter of 0.45 ⁇ m, and then subjected to a measurement of an eluted total organic carbon using TOC-5000A manufactured by Shimadzu Corporation.
  • the polylactic acid film with a thickness of 100 ⁇ m was enzymatically degraded, and subjected to the measurement of an eluted total organic carbon in the same procedure. Table 2 as follows shows the results.
  • a film was formed in the same manner as that in Example 1 except that the content of polyethylene oxalate was changed to 5% by weight.
  • a film was formed in the same manner as that in Example 5 except that maleic anhydride (manufactured by Wako Pure Chemical Industries, Ltd.) was used in place of polyethylene oxalate, and that chloroform was used as the solvent.
  • maleic anhydride manufactured by Wako Pure Chemical Industries, Ltd.
  • a film was formed in the same manner as that in Example 5 except that polyethylene succinate was used in place of polyethylene oxalate, and that chloroform was used as the solvent.
  • polyethylene succinate was synthesized as follows.
  • a film was formed in the same manner as that in Example 5 except that polyethylene glycol was used in place of polyethylene oxalate, and that chloroform was used as the solvent.
  • polyethylene glycol used herein was PEG 3000 manufactured by Wako Pure Chemical Industries, Ltd.
  • a film was formed in the same manner as that in Example 5 except that stearic acid (manufactured by Wako Pure Chemical Industries, Ltd.) was used in place of polyethylene oxalate, and that chloroform was used as the solvent.
  • stearic acid manufactured by Wako Pure Chemical Industries, Ltd.
  • chloroform was used as the solvent.
  • a film made of polylactic acid alone was formed in the same manner as that in Example 5 except that no polyethylene oxalate was added.
  • an enzymatic degradation solution was prepared by adding 12 ⁇ l of the enzyme solution into 10 ml of the 0.01 M Tris-HCl buffer (pH 8.0).
  • the films of Example 5, Reference Example 1 and Comparative Examples 4 to 7 each cut into 2 cm ⁇ 2 cm were immersed, and shaken at 37°C and at 50 rpm. After 1 week, the internal structure of each film was observed with an electron microscope. Fig. 4 shows the electron microphotographs. When the internal structures of each film before and after the reaction were compared, it can be seen that degradation proceeded from the inside of the film in Example 5 where oxalic acid was released by hydrolysis and in Reference Example 1 where maleic acid was released by hydrolysis.
  • films were formed in which polyethylene oxalate (PEOx) and poly(neopentyl) oxalate (PNOx) were respectively dispersed in polylactic acid (PLA), and subjected to enzymatic degradation test.
  • PEOx polyethylene oxalate
  • PNOx poly(neopentyl) oxalate
  • 5g of PLA was dry-blended with 0.5g of PEOx, and then kneaded (200°C, 50 rpm) by a micro kneader manufactured by Toyo Seiki Seisaku-sho, LTD.
  • the obtained pellet containing 5% PEOx or PNOx was dissolved at 200°C for 5 minutes, and then heat-pressed at a pressure of 40 to 50 kgf/cm 2 to form a film.
  • a film was formed in the same manner as that in Example 6 except that polyneopentyl oxalate (PNOx) was used in place of polyethylene oxalate.
  • PNOx polyneopentyl oxalate
  • polyneopentyl oxalate was synthesized as follows.
  • a film made of polylactic acid alone was formed in the same manner as that in Example 6 except that no polyethylene oxalate was added.
  • Polylactic acid, polyethylene oxalate, and polyneopentyl oxalate used in above-described Example 6, Example 7, and Comparative Example 8 have the following properties.
  • Tg Glass transition temperature SP value: Solubility parameter (based on the Fedors method)
  • Fig. 6 shows dissolution test results obtained by dissolving each polymer of polyethylene oxalate and polyneopentyl oxalate alone in water. It can be seen that PEOx high in SP value, i.e., highly polarized PEOx, starts to hydrolyze at an earlier stage.
  • An enzymatic degradation solution was prepared by adding 12 ⁇ l of the enzyme solution into 10 ml of a 20 mM phosphate buffer (pH 7.0).
  • the films of Example 6, Comparative Example 7 and Comparative Example 8 each cut into 2 cm ⁇ 2 cm were immersed, and shaken at 37°C and at 100 rpm.
  • Fig. 7 shows weight decrease after two-day and one-week reaction.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
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Claims (8)

  1. Composition de résine aisément dégradable, comprenant :
    - un polyester aliphatique (A) qui est biodégradable,
    - et un polyester aliphatique (B) dispersé dans ledit polyester aliphatique (A), qui est biodégradable à une vitesse de dégradation plus grande que celle du polyester aliphatique (A) et qui présente une viscosité à l'état fondu, à 190 °C et à une vitesse de cisaillement de 1 rad/s, inférieure ou égale à 50 Pa.s, ou une viscosité en solution ηinh, mesurée pour une concentration de 0,4 g/dL et à la température de 30 °C dans un solvant constitué d'un mélange de m-chloro-phénol et de 1,2,4-trichloro-benzène en une proportion de 4/1 en poids, inférieure ou égale à 0,25 dL/g, lequel polyester aliphatique (B) présente un paramètre de solubilité, calculé selon la méthode de Fédor, supérieur ou égal à 25, et lequel polyester aliphatique (B) est contenu dans la composition en une proportion de 1 à 30 % en poids,
    étant entendu qu'une enzyme peut pénétrer et agir dans les vides d'où le polyester aliphatique (B) dégradé a été libéré pour se dissoudre dans l'eau, dégradant ainsi la composition de l'intérieur et en accélérant la dégradation.
  2. Composition de résine aisément dégradable, comprenant :
    - un polyester aliphatique (A) qui est biodégradable,
    - et un polyester aliphatique (B') dispersé dans ledit polyester aliphatique (A), qui est biodégradable à une vitesse de dégradation plus grande que celle du polyester aliphatique (A) et qui libère, après hydrolyse, un acide donnant un pH inférieur ou égal à 2,0 quand il est dissous dans l'eau à une concentration de 0,005 g/mL, lequel polyester aliphatique (B') présente un paramètre de solubilité, calculé selon la méthode de Fédor, supérieur ou égal à 25, et lequel polyester aliphatique (B') est contenu dans la composition en une proportion de 1 à 30 % en poids,
    étant entendu que le polyester aliphatique (B') est hydrolysé au sein de la composition de résine aisément dégradable et que le composant acide élué provoque l'hydrolyse du polyester aliphatique (A) et en accélère la dégradation.
  3. Composition de résine aisément dégradable, conforme à la revendication 1 ou 2, dans laquelle le polyester aliphatique (B) ou (B') est contenu en une proportion de 1 à 5 % en poids.
  4. Composition de résine aisément dégradable, conforme à la revendication 2, dans laquelle l'acide libéré est de l'acide oxalique ou de l'acide maléique.
  5. Composition de résine aisément dégradable, conforme à la revendication 1 ou 2, dans laquelle le polyester aliphatique (B) ou (B') comprend, en tant que composant de copolymérisation, un monomère, au nombre d'au moins un, du polyester aliphatique (A).
  6. Composition de résine aisément dégradable, conforme à la revendication 1 ou 2, dans laquelle le polyester aliphatique (B) ou (B') inclut du poly(éthylène oxalate).
  7. Composition de résine aisément dégradable, conforme à la revendication 1 ou 2, dans laquelle le polyester aliphatique (A) inclut une résine de poly(acide lactique) ou du poly(butylène succinate).
  8. Récipient biodégradable comprenant une composition de résine aisément dégradable, conforme à la revendication 1 ou 2.
EP07828406.4A 2006-09-26 2007-09-26 Composition de résine rapidement dégradable et récipient biodégradable utilisant cette composition Active EP2080787B1 (fr)

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EP2080787A4 (fr) 2010-12-22
PL2080787T3 (pl) 2016-05-31
US20100086718A1 (en) 2010-04-08
CN101541887B (zh) 2012-07-18
EP2080787A1 (fr) 2009-07-22
CN101541887A (zh) 2009-09-23
KR20090054454A (ko) 2009-05-29
KR101118895B1 (ko) 2012-03-19
US8048502B2 (en) 2011-11-01
WO2008038648A1 (fr) 2008-04-03
JPWO2008038648A1 (ja) 2010-01-28
JP5440998B2 (ja) 2014-03-12

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